Centralize weather event and driver identifiers

internal/sources/openweather/source_test.go

@@ -5,12 +5,13 @@ import (
 
 	"gitea.maximumdirect.net/ejr/feedkit/config"
 	"gitea.maximumdirect.net/ejr/feedkit/event"
+	"gitea.maximumdirect.net/ejr/weatherfeeder/standards"
 )
 
 func TestObservationSourceAdvertisesKinds(t *testing.T) {
 	src, err := NewObservationSource(config.SourceConfig{
 		Name:   "openweather-observation-test",
-		Driver: "openweather_observation",
+		Driver: DriverObservation,
 		Mode:   config.SourceModePoll,
 		Params: map[string]any{
 			"url":        "https://example.invalid?units=metric",
@@ -20,7 +21,7 @@ func TestObservationSourceAdvertisesKinds(t *testing.T) {
 	if err != nil {
 		t.Fatalf("NewObservationSource() error = %v", err)
 	}
-	if got := src.Kinds(); len(got) != 1 || got[0] != event.Kind("observation") {
+	if got := src.Kinds(); len(got) != 1 || got[0] != event.Kind(standards.KindObservation) {
 		t.Fatalf("Kinds() = %#v, want [observation]", got)
 	}
 }